journaldev/Python-3/basic_examples/python_dictionary_examples.py at master · SelvaGaneshM/journaldev · GitHub

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my_dictionary = {}  # init empty dictionary

# init dictionary with some key-value pair
another = {
    # key    : value,
    'man': 'Bob',
    'woman': 'Alice',
    'other': 'Trudy'
}

# print initial dictionaries
print(my_dictionary)
print(another)

# insert value
my_dictionary['day'] = 'Thursday'
another['day'] = 'Thursday'
my_dictionary['color'] = 'Blue'
another['color'] = 'Blue'

# print updated dictionaries
print('Updated Dictionaries:')
print(my_dictionary)
print(another)

# update values
my_dictionary['day'] = 'Friday'
another['day'] = 'Friday'
my_dictionary['color'] = 'Black'
another['color'] = 'Black'

# print updated dictionaries
print('After Update:')
print(my_dictionary)
print(another)

# printing a single element
print(my_dictionary['day'])
print(another['color'])

# add to dictionary
d = {'a': 1, 'b': 2}
print(d)
d['a'] = 100  # existing key, so overwrite
d['c'] = 3  # new key, so add
d['d'] = 4
print(d)

if 'c' not in d.keys():
    d['c'] = 300

if 'e' not in d.keys():
    d['e'] = 5

print(d)